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René Mächler (CH 1937): Schwarzes Quadrat, halbseitig strahlend, 1978/81.
Unique luminogram on selen protected gelatin silver paper, 29.5 x 29.5.
Gottfried Jäger Collection, Bielefeld
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René Mächler (CH 1937): Construction (WVZ 14/90), 1990.
Unique luminogram on gelatin silver paper, 35 x 27 cm.
Gottfried Jäger Collection, Bielefeld